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Download Vol. 18, No. 1 BULLETIN of the FLORIDA STATE MUSEUM Biological Sciences Volume 18 1974 Number 1 THE STATUS OF Desmognathus brimleyorum STEJNEGER AND AN ANALYSIS OF THE GENUS Desmognathus ( AMPHIBIA: URODELA) IN FLORIDA D. BRUCE MEANS #31 »f..3 r - ',S r m S' * '*T & I S ** UNIVERSITY OF FLORIDA GAINESVILLE Numbers of the BULLETIN OF THE FLORIDA STATE MUSEUM, B~OLOCICAL SCIENCES, are published at irregular intervals. Volumes contain about 300 pages and , are not necessarily completed in any one calendar year. CARTER R. GILBERT, Editor RHODA J. RYBAK, Managing Editor Consultant for this issue: CHARLES F. WALKER Communications concerning purchase or exchange of the publications and all manu- scripts should be addressed to the Managing Editor of the Bulletin, Florida State Museum, Museum Road, University of Florida 32611. This public document was promulgated at an annual cost of $2403.52 or $2.404 per copy. It makes available to libraries, scholars, and all interested persons the results of researches in the natural sciences, emphasizing the Circum-Caribbean region. Publication date: March 8, 1974 Price: $2.45 THE STATUS OF Desmognathus brimleyorum STEJNEGER AND AN ANALYSIS OF THE GENUS Desmognathus (AMPHIBIA: URODELA) IN FLORIDA D. BRUCE MEANsl SYNOPSIS: This is a systematic study of three externally similar species of plethodontid salamanders C genus Desmognathus) previously considered to occur sympatrically in northern Florida ( D. auriculatus, D. brimleyorum, and D. fuscus). Larval mor- phology, color pattern, relative size, and tail morphology were reinvestigated. The morphology of teeth, jaw profile, premaxillary fontanelle, and prearticular spine were studied in detail for the first time, and color changes due to ontogenetic melanization and to metachrosis were also evaluated. All the above characteristics were found to be taxonomically signifcant. In addition, the microhabitat selection and ecological associates of D. auriculatus and D. fuscus were different, indicating ecological isola- tion of the two species in the area of sympatric contact in northern Florida. Desmog- nathus brimleyomm Stejneger is a species endemic to the Ouachita Mountains of Arkansas and Oklahoma. The name D. fuscus carri Neill is a synonym of D. at,ri- culatus Holbrook. Populations referred to D. fuscus in this study compared mor- phologically more closely with D. ochrophaeus from the southern Appalachians than with populations from near the type locality of D. fuscus Rafinesque. 1 The author is a Ph.D. candidate in the Department of Biological Science at Florida State University, Tallahassee, Florida 82806, and a Research Associate at Tall Tim- bers Research Station, Route 1, Box 160, Tallahassee, Florida 82801. This study was submitted to the Florida State University, Department of Biological Science as partial fulfillment of the requirements for the degree of Master of Science. Manu- script accepted 2 April 1973. Ed. Means, D. Bruce. 1974. The Status of Desmognathus brimle!/orum Stejneger and an analysis of the genus Desmognathus (Amphibia: Urodela) in Florida, Bull. Florida State Mus., Biol. Sci., Vol. 18, No. 1, pp 1-100. 2 BULLETIN FLORIDA STATE MUSEUM Vol. 18 No. 1 TABLE OF CONTENTS INTRODUCrION 2 Taxonomic History of the Genus Desmognathus in Florida 6 METHODS 7 8 ACKNOWLEDGMENTS 9- RESULTS Tooth Morphology 9 Jaw Profile 11 Premaxillary Fontanelle 12 Prearticular Spine 13 Tail Morphology - 14 Relative Size ( SVL) 14 Color Pattern 16 Melanization and Metachrosis 20 Larval Morphology 23 Microhabitat Selection 23 Ecological Associates 25 Summary of Differences between Taxa 26 27 DISCUSSION Status of Desmognathus brimleyorum Stejneger 27 Relation of auriculatus to fuscus in Florida 28 Relation of Florida fuscus to ochrophaeus 35 CONCLUSIONS 36 SPECIMENS EXAMINED 37 CI'TED 42 FIGURESLrrERATURE 46 INTRODUCTION The plethodontid salamander genus Desmognathus Baird, 1849, has a long and complicated taxonomic history ( for partial reviews, see Dunn 1917, Folkerts 1968, Hinderstein 1969). Over 30 species and subspecies were described between 1820 and 1958. Of these at least six species ( D. aeneus, fuscus, monticola, ochrophaeus, quadramaculatus and wrighti) are presently recognized by most authors ( Conant 1958, Wake 1966, Brame 1966, Coin and Cochran 1970). All of the above species, except D. wrighti, are polytypic. Of these Desmognathus fuscus has been split at one time or another into 11 sub- species ( auriculatus. brimlegorum, carolinensis, carri, conanti, fuscus, imitator, perapsus, planiceps, ocoee, welteri). Desmognathus ochro- phaeus, aeneus, monticon, and quadramaculatus have each been consid- ered ditypic. None of the last three names has ever been synonomized under D. fuscus, but ochrophaeus has been considered as a subspecies of fuscus ( Allen 1901, Fowler 1906). For purposes of communication some of the above names will be grouped into three complexes, hereafter re- ferred to as: (1) auriculatus complex ( auricubtus, carni ); (2) fuscus complex ( conanti, fuscus, welteri ); and (3) ochrophaeus complex ( caro- 1974 MEANS: STUDIES ON THE GENUS DESMOGNATHUS 3 linensis, imitator, perlapsus, planiceps, ochrophaeus, ocoee). D. brim- legorum will be treated as a full species. Recently there has been disagreement on the number of subspecies in D. fuscus in the Coastal Plain of the eastern United States. Some work- ers have considered auriculatus and brimleyorum to be subspecies of D. fuscus (Ci. Chaney 1958, Folkerts 1968, Harima 1969 ) but others have ac- corded them full specific rank ( Valentine 1961, 1963, Wake 1966, Coin and Cochran 1970). The reasons for the different interpretations probably stem from three major factors. First is the extensive geographic range of the forms in- volved. D. f. fuscus ( nominate race of the type species of the genus; type locality, "northern New York") ranges northward to the St. Law- renee River drainage in New England and southeastern Quebec and into New Brunswick ( Bleakney 1958). The fuscus and ochrophaeus com- plexes occur southward throughout the Appalachians ( where they are represented by the most named forms: ochrophaeus, fuscus, ocoee, imi- tator, planiceps ), Piedmont ( fuscus ), and Coastal Plain physiographic provinces to Florida ( fuscus and auriculatus). Thence, members of the fuscus or auriculatus complexes, or both, range westward to about the western limit of the Austroriparian Biotic Province in eastern Texas ( Sanders and Smith 1949). The Ouachita Mountains of southeastern Oklahoma and southwestern Arkansas appear to be the northwestern limit of the range of the subfamily Desmognathinae, where it is repre- sented by brimlegorum. No previous worker has dealt with fuscus or auriculatus throughout the entire range of either complex. A second factor is the lack in salamanders of external, taxonomically utilizable meristic characters. Salamanders are smooth-skinned, usually lacking in epidermal accoutrements such as excrescenses, tubercles, and scales. One of few such chdracters is costal groove number, but this is not variable infragenerically in Desmognathus. The third, and most important, factor contributing to the dimculties encountered in determining systematic relationships in the genus is varia- tion, both individual and populational. Mayr ( 1969: 147 ) lists 17 types of variation that can be found within a single population. Members of Desmognathus under consideration in this study may be influenced by at least ten of these. Each is briefly discussed. AGE VARIATIoN.-Members of the fuscus, auriculatus, and ochro- phaeus complexes pass through a brief larval period of 2-6 months after hatching from the egg ( Wilder 1913, Chaney 1949, Hairston 1949, Eaton 1956, Organ 1961, Tilley 1968). The larval morphology differs from the post-transformation morphology in several important respects: larvae possess external gills, undivided monocuspid teeth, distinct palatal mor- 4 BULLETIN FLORIDA STATE MUSEUM Vol. 18 No. 1 phology, tail fins, -suctorial" mouth, and lack eyelids. Post-larval indi- viduals lack gills and fins, and possess pedicillate, bicuspid teeth, eyelids, and reorganized mouthparts. After metamorphosis there is a 2-3 year juvenile state in which no dimorphism is apparent in any potential sec- ondary sex character ( Chaney 1949, Hairston 1949, Organ 1961, Tilley 1968). Sexual maturity is probably attained by most members of the fuscus complex after 2-4 years of age for males and 3-4 for females ( Organ 1961, Tilley 1968). There is a very definite ontogenetic progres- sion of color pattern from a dorsally spotted larval and juvenile pattern in all forms to old males and sometimes old females that are entirely dark. Males have a characteristic change in testicular lobing correlated with age ( Kingsbury 1902, Humphrey 1922, Noble 1927). SEASONAL VARIATION.-Males and females show seasonal variation in gonadal activity expressed as morphological change. Males undergo slight changes in the size of the mental gland and in the lining of the vent correlated with the advent of the breeding season ( Noble 1931, Hays 1966). Gravid females become plump, and large white ova can be seen through the abdominal wall. HABITAT VARIATION.-It has been experimentally demonstrated that individuals of D. auriculatus may undergo color change stimulated by differently colored substrates ( Grobman 1950). In southern Alabama and northern Florida it has been suggested that auriculatus is an ecophe- notype of the species Desmognathus fuscus found in mucky soils ( Folk- erts 1968). DENSITY DEPENDENT VARIATION.-Although no
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